CVE-2026-72006 (GCVE-0-2026-72006)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:06
VLAI
Title
net/mlx5: free mlx5_st_idx_data on final dealloc
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: free mlx5_st_idx_data on final dealloc Workloads that repeatedly allocate and release mkeys carrying TPH steering-tag hints (e.g. churning RDMA MRs) leak one struct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced and the kmalloc slab grows over time. When the last reference to an ST table entry is dropped, mlx5_st_dealloc_index() removed the entry from idx_xa but the backing mlx5_st_idx_data allocation was never freed. Free idx_data after the xa_erase() so the lifetime of the bookkeeping struct matches the lifetime of the ST entry it tracks.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 888a7776f4fb04c19bec70c737c61c2f383c6b1e , < 262da8b6ea03d01ee7ed01ad309e4c89941f6b14 (git)
Affected: 888a7776f4fb04c19bec70c737c61c2f383c6b1e , < 6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75 (git)
Affected: 888a7776f4fb04c19bec70c737c61c2f383c6b1e , < df6134b527a88b3e65ba6ae5073664af091d5fd2 (git)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/lib/st.c"
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              "operator": "OR"
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      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: free mlx5_st_idx_data on final dealloc\n\nWorkloads that repeatedly allocate and release mkeys carrying TPH\nsteering-tag hints (e.g. churning RDMA MRs) leak one\nstruct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced\nand the kmalloc slab grows over time.\n\nWhen the last reference to an ST table entry is dropped,\nmlx5_st_dealloc_index() removed the entry from idx_xa but the backing\nmlx5_st_idx_data allocation was never freed.\n\nFree idx_data after the xa_erase() so the lifetime of the bookkeeping\nstruct matches the lifetime of the ST entry it tracks."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:06:27.714Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75"
        },
        {
          "url": "https://git.kernel.org/stable/c/df6134b527a88b3e65ba6ae5073664af091d5fd2"
        }
      ],
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72006",
    "datePublished": "2026-08-15T05:51:36.635Z",
    "dateReserved": "2026-08-09T03:40:39.899Z",
    "dateUpdated": "2026-08-17T05:06:27.714Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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                "programFiles": [
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                ],
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: free mlx5_st_idx_data on final dealloc\n\nWorkloads that repeatedly allocate and release mkeys carrying TPH\nsteering-tag hints (e.g. churning RDMA MRs) leak one\nstruct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced\nand the kmalloc slab grows over time.\n\nWhen the last reference to an ST table entry is dropped,\nmlx5_st_dealloc_index() removed the entry from idx_xa but the backing\nmlx5_st_idx_data allocation was never freed.\n\nFree idx_data after the xa_erase() so the lifetime of the bookkeeping\nstruct matches the lifetime of the ST entry it tracks."
          }
        ],
        "id": "CVE-2026-72006",
        "lastModified": "2026-08-17T06:17:58.083",
        "metrics": {},
        "published": "2026-08-15T06:20:59.250",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/262da8b6ea03d01ee7ed01ad309e4c89941f6b14"
          },
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        "vulnStatus": "Received"
      }
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      "current_release_date": "2026-08-17T16:05:09+00:00",
      "cve": "CVE-2026-72006",
      "id": "CVE-2026-72006",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "122",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5: free mlx5_st_idx_data on final dealloc",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72006.json",
      "version": "3"
    }
  }
}



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